Senior MERN Stack Dev - React & Node.js Growth Role in Columbus
Career & Market Insight
This is a senior-level full-stack role demanding 5+ years of hands-on MERN experience, architectural ownership, and leadership capabilities such as code reviews and design discussions. It's positioned well above a mid-level engineering role.
Compensation context: No salary range is disclosed, which is a yellow flag. Senior MERN/React developers typically earn $90K–$150K+ annually in Western markets. As a Proxify contract placement, rates can vary widely — candidates should clarify compensation expectations early in the process.
Skills developed here are highly marketable:
- React architecture (hooks, SSR/SSG, performance) — among the most in-demand front-end skills globally.
- Node.js microservices, GraphQL, and event-driven design — critical for backend scalability roles.
- AI/vector database integration (nice-to-have) — an emerging, high-value specialization.
- DevOps/CI-CD (Docker, GitHub Actions, AWS) — rounds out a strong T-shaped profile.
Green flags: Long-term remote placement, predictable hours (no crunch culture implied), structured onboarding through Proxify, and access to high-growth client companies. Yellow flags: No disclosed salary, contract-based employment (no equity or corporate benefits), and the 8-hour structured workday may feel rigid for senior engineers used to outcome-based cultures. Overall, this is a solid growth opportunity for a senior developer wanting stability with remote flexibility.
Headquarters: Sweden
URL: http://career.proxify.io
We are looking for a Senior MERN Stack Developer with heavy specialization in React.js and Node.js on behalf of one of our high-growth clients to architect, scale, and maintain high-throughput web applications. In this role, you will take operational ownership of both front-end user interfaces and back-end microservices, delivering seamless, secure, and responsive digital products. You will bridge user-facing features with complex database architectures and cloud infrastructure. You are a perfect candidate if you are growth-oriented, you love what you do, and you enjoy working on new ideas to develop exciting products.
What We Are Looking For:
- 5+ years of professional software engineering experience designing, building, and deploying end-to-end applications using MongoDB, Express.js, React.js, and Node.js.
- Deep proficiency in modern JavaScript (ES6+), TypeScript, asynchronous programming, event loops, and memory management across client and server environments.
- Deep mastery of React internals, custom hooks, component design patterns, state management (Redux Toolkit, Zustand, or React Query), SSR/SSG frameworks (Next.js is a strong plus), and performance optimization (virtualization, code splitting, Web Vitals).
- Proven experience architecting scalable RESTful APIs, WebSockets, and/or GraphQL services. Proficiency with middleware design, authentication protocols (JWT, OAuth2, Passport.js), and event-driven architectures.
- Advanced knowledge of MongoDB schema design, aggregation pipelines, index strategy, performance tuning, and ORMs/ODMs like Mongoose or Prisma.
- Strong commitment to test-driven development using frameworks like Jest, React Testing Library, and Cypress, alongside hands-on experience with Docker, CI/CD pipelines (GitHub Actions), and AWS cloud services.
- Time zone: CET (+/- 3 hours). Applications from candidates outside this time zone range cannot be considered.
Nice-to-Have:
- Experience with Next.js or Remix for production-grade full-stack React frameworks.
- Familiarity with relational databases (PostgreSQL, MySQL) alongside MongoDB.
- Experience with vector databases or AI model integration into Node.js backend services.
- Exposure to micro-frontends or monorepo setups (Turborepo, Nx).
Responsibilities:
- Design, develop, and deploy scalable full-stack features from initial database schema creation down to polished, pixel-perfect React interfaces.
- Build secure, high-concurrency microservices and web services, managing integrations with third-party APIs, webhooks, and real-time communication channels.
- Audit, profile, and optimize application throughput—reducing bundle sizes and rendering overhead on the front end while optimizing database queries and caching layers (Redis) on the back end.
- Lead architectural discussions, write modular and well-documented TypeScript code, enforce strict testing protocols, and conduct thorough peer code reviews.
- Collaborate with cloud and DevOps engineers to containerize applications, set up automated deployment pipelines, and maintain system monitoring tools.
What We Offer:
- Get paid, not played: No more unreliable clients. Enjoy on-time monthly payments with flexible withdrawal options.
- Predictable project hours: Enjoy a harmonious work-life balance with consistent 8-hour working days with clients.
- Flex days to recharge: Up to 24 flex days off per year without losing pay, for full-time positions found through Proxify.
- Career-accelerating positions: Exclusive long-term remote positions at the world's most exciting companies.
- Hand-picked opportunities: Skip the typical recruitment roadblocks and biases with personally matched positions.
- One seamless process, multiple opportunities: A one-time contracting process for endless opportunities, with no extra assessments.
- Consistent compensation: Enjoy the same pay, every month with positions landed through Proxify.
To apply: https://weworkremotely.com/remote-jobs/proxify-ab-senior-mern-developer-react-js-node-js
Frequently Asked Questions
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